Erosion

The planting of vegetation on excavated soil to hold it in place is a land treatment called:

• mulching.

• a silt fence.

• a cover crop.

• strip cropping.

Planting on the contour is a soil conservation method described as:

• making ridges of earth across a slope.

• planting across the slope of a hill.

• planting different crops from year to year.

• constructing small ditches across slopes.

The main type of erosion that happens on sandy soils is:

• glaciers.

• land slippage.

• water.

• wind.

Planting different crops in alternate sections on sloping land is called:

• conservation tillage.

• rotating crops.

• strip cropping.

• terracing.

Of all the types of erosion, which form is the major cause of soil loss in North America?

• glacier erosion

• land slippage erosion

• water erosion

• wind erosion

Not planting the same crop in the same place year after year is known as:

• conservation tillage.

• diversion ditches.

• rotating crops.

• strip cropping.

When rill erosion is uncontrolled, the main result is:

• aseptic erosion.

• glacial erosion.

• sheet erosion.

• gully erosion.

What is it called when rows of trees are planted to prevent soil erosion on level, sandy land?

• conservation tillage

• diversion ditch

• strip cropping

• windbreak

When small channels form on sloping land where running water from precipitation has washed soil away, it is best called:

• gully erosion.

• rill erosion.

• sheet erosion.

• slippage erosion.

When topsoil is removed at an excessive rate, usually caused by humans, it is best called:

• accelerated erosion.

• glacial erosion.

• natural erosion.

• shore erosion.